import java.sql.*;

public class Main {
    public static void main(String[] args) {
        Connection connection =null;
        PreparedStatement preparedStatement =null;
        ResultSet resultSet =null;
        //1.加载驱动
        try {
            Class.forName("com.mysql.cj.jdbc.Driver");
            //2.创建连接
            String url = "jdbc:mysql://127.0.0.1:3306/jdbc?characterEncoding=utf-8";
            connection = DriverManager.getConnection(url, "root", "050420");
            //  if(connection!=null){
            //     System.out.println("连接成功");
            //  }
            //3.sql
            String sql = "select * from user";
            //4.预编译sql
             preparedStatement = connection.prepareStatement(sql);
            //5.
            resultSet = preparedStatement.executeQuery();
            //6.遍历结果
            while (resultSet.next()) {
                int id = resultSet.getInt(1);
                String name = resultSet.getString(2);
                String pass = resultSet.getString(3);
                System.out.println(id + "----" + name + "----" + pass);
            }



        }catch (SQLException ex) {
            throw new RuntimeException(ex);
        } catch (ClassNotFoundException ex) {
            throw new RuntimeException(ex);
        }finally{
            //7.关闭资源

            try {
                if (resultSet!=null) {
                    resultSet.close();
                }
                if (preparedStatement!=null) {
                    preparedStatement.close();
                }
                if (connection!=null) {
                    connection.close();
                }
            } catch (SQLException e) {
                throw new RuntimeException(e);
            }
        }


    }

}